Search found 1564 matches

by ChenBeier
Tue Nov 05, 2019 3:53 am
Forum: Chemistry forum
Topic: Styrene to 2-phenylethanol?
Replies: 1
Views: 4605

The boran will add to the vinyl doublebond of styrene and build the Anti Markovnikov product. You have 2-Phenyl-ethylboran. With Peroxid you can oxidise it and get the alcohol. C6H5-CH=CH2 + BH3(CH3)2S => C6H5-CH2-CH2-BH2 + (CH3)2S C6H5-CH2-CH2-BH2 + 3 H2O2 + 3 OH- => C6H5-CH2-CH2-OH + BO3 3- + 5 H2O
by ChenBeier
Fri Nov 01, 2019 9:40 am
Forum: Chemistry forum
Topic: Equilibrio quimico-Fisico quimica
Replies: 1
Views: 4255

Translation in English I need help with this problem plss. A mixture of CoO (s) + Fe3O4 (s) is processed in an oven at 800C to produce cobalt. Faith must be retained as Fe3O4 (s). The gas available for reduction contains 22.4% CO, 34.6% CO2, 43% N2. It can be assumed that the gas left by the oven is...
by ChenBeier
Wed Oct 30, 2019 12:14 pm
Forum: Chemistry forum
Topic: redox reaction
Replies: 3
Views: 5870

MnO4- + 8 H+ + 5 e- => Mn2+ + 4 H2O Reduction

H2O2 => O2 + 2 H+ + 2 e- Oxidation

Can you continue now?
by ChenBeier
Mon Sep 16, 2019 12:03 pm
Forum: Chemistry forum
Topic: Material and heat balance (ferromolybdenum reaction)
Replies: 2
Views: 4888

The question is which alloy will be produced. MoFe or something else.

The oxides will be reduced by the aluminium, like Thermit reaction.

Convert everything to moles. Check what is more or less.
by ChenBeier
Sat Sep 14, 2019 4:33 am
Forum: Chemistry forum
Topic: oxalic acid and sulfuric acid
Replies: 1
Views: 4401

There will be also CO . Carbonmonoxide.
by ChenBeier
Sat Sep 14, 2019 4:31 am
Forum: Chemistry forum
Topic: ZnBr2 + CO2
Replies: 1
Views: 4508

There is not muxh effect. It is to acidic. If you add Carbonate then you get precipitation of ZnCO3.
by ChenBeier
Wed Sep 11, 2019 1:36 am
Forum: Chemistry forum
Topic: Precipitation
Replies: 1
Views: 4486

Arsenic nitrate is not existing. If it would exist it would hydrolyse to arsenious acid and nitric acid in aquaeous solution. Both are solouble. Silver has no effect.
by ChenBeier
Tue Sep 03, 2019 4:04 am
Forum: Chemistry forum
Topic: Solubility Question Help
Replies: 1
Views: 4429

This really is made on paper not as a experiment. 1. Silverbromide will precipitate. 2. It also precipitate, can be Calcium, Strontium or Barium as sulfate. 3. Now the Joke comes. Sulfate was poured in step 2 first, if you put Bariumchloride in of coures Bariumsulfate will precipitate again. 4. Coun...
by ChenBeier
Thu Aug 29, 2019 12:40 pm
Forum: Chemistry forum
Topic: Help with this chem problem
Replies: 3
Views: 5131

Post your result.
by ChenBeier
Thu Aug 29, 2019 8:23 am
Forum: Chemistry forum
Topic: Need help with analytical chemistry Ques
Replies: 1
Views: 4193

You have mistypings.

Kl = [Th4+] * [(OH-)^4]

Th = x , OH- = 4x

Kl = x* (4x)^4

Kl = 256 * x^5

x =5√ (Kl/256)

x = 5√(1.1 * 10^-15/256)

x = 3,36 * 10^-4

OH- = 4*x

OH- = 1,34 * 10^-3 mol/l
by ChenBeier
Wed Aug 28, 2019 11:50 pm
Forum: Chemistry forum
Topic: Help with this chem problem
Replies: 3
Views: 5131

Magnesium hydroxide has very poor soloubility, only 9mg/l. So what is described is not possible. But generally, what are the formula of both components. Develop the correct equation and combine them that you get the product. For the limiting reactant calculate the moles of each and combine with the ...
by ChenBeier
Thu Aug 08, 2019 12:17 am
Forum: Chemistry forum
Topic: experimento para feria de ciencia
Replies: 1
Views: 4706

Translation in English: Hi, I have to do a project for a fair and I was planning to make a reagent that reacts to alcohol-diluted ketamine. Does anyone know any reagent or how can I do it? must be an edible reagent Test in the market but not edible. La prueba está en el mercado, pero no es comestib...
by ChenBeier
Tue Jul 09, 2019 4:54 am
Forum: Chemistry forum
Topic: Chemistry, Materials science
Replies: 1
Views: 4712

This reaction will not work
Tin is a reducer and stibium is a oxidizer, it will never get SnSb. Probably Sn-IV and Sb.
What is the organic compound.C6H5O7Na3, is it trisodium-citrate?
NaHCO3 and HCl can not exist together. it will be NaCl and H2O and CO2
HCl5 is also not existing.
by ChenBeier
Mon Jul 08, 2019 2:18 am
Forum: Chemistry forum
Topic: Help me on this reaction
Replies: 1
Views: 4908

Silver

Check Tollens reaction
by ChenBeier
Mon Jul 01, 2019 9:10 am
Forum: Chemistry forum
Topic: Forming a reaction with K2Cr2O7
Replies: 1
Views: 4707

Depending of the amount of Strontium:

Sr2+ + K2Cr2O7 => SrCr2O7 + 2 K+

2 Sr2+ + K2Cr2O7 + H2O => 2 SrCrO4 + 2 K+ + 2 H+